Two position valves switch back and forth between Load and Inject, or Position A and Position B. Selectors (
multiposition valves) operate in continuous revolutions by incremental steps.
There are several ways to actuate each type of valve, along with a number of supporting controllers and devices
to interface the actuators with computer-controlled systems.

Valves in ovens require a standoff assembly to keep the actuator out of the heated zone.
If a valve is not going to be heated beyond the temperature range of the actuator,
closemount hardware often makes the cleanest installation.